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Noth the Plaguebringer!

Click here to see the Tankspot video on the fight

Noth the Plaguebringer has two Phases - during Phase 1 he will be on the ground, damaging the raid directly and summoning Plagued Warriors. After 110 seconds in Phase 1, he will teleport to his balcony, entering Phase 2. During this phase, waves of adds will spawn from the piles of bones on the right side of the room.
Phase 2-1*: 2 Plagued Champions
Phase 2-2: 1 Plagued Champion and 1 Plagued Guardian.
Phase 2-3: 2 Plagued Guardians
*2-1 is the first Phase 2 (110 seconds after the beginning). 2-2 is the second Phase 2 (290 seconds after the beginning). 2-3 is the third Phase 2 (400 seconds after the beginning).
After 70 seconds in Phase 2, Noth will come back and re-enter Phase 1.

In Normal difficulty, Noth the Plaguebringer has approximately 2,500,000 hit points.

Abilities
Phase 1: Ground Phase
Curse of the Plaguebringer - Places a curse on 3 party members. After 10 seconds, every cursed target will cast Wrath of the Plaguebringer, which will hit everybody in 30 yards range for 3,700 to 4,300 Shadow damage and additional 1,313 to 1687 Shadow damage every 2 seconds, for 10 seconds.
Cripple - Noth will place a magic debuff on a few players in melee range, reducing their attack speed by 100% and movement speed and Strength by 50%, for 15 seconds.
Plagued Warriors - Summoned every 30 seconds while in Phase 1. Have ~100,000 hit points, and use Cleave, dealing 110% weapon damage to two targets..
Teleport Up - After 110 seconds on the ground, Noth will teleport to his balcony, entering Phase 2.
Phase 2: Balcony Phase
Plagued Champions - Summoned during Phase 2-1 and 2-2. Have ~105,000 hit points. They will use Mortal Strike, dealing 100% weapon damage and reducing healing done by 50% and Shadow Shock, which hits nearby enemies for 2,313 to 2,687 Shadow damage.
Plagued Guardians - Summoned during Phase 2-2 and 2-3. Have ~75,000 and low melee damage. Their primary damaging ability is Arcane Explosion, which hits every in 30 yards range for 2,313 to 2,687 Arcane damage.
Teleport down - After 70 seconds on the balcony, Noth will teleport back to the ground, re-entering Phase 1.

 

 

 

 

 

Heigan the Unclean!

Click here to see the Tankspot video on this fight

Heigan the Unclean features the famous "Heigan dance", which is the only real danger of the fight.
Throughout the encounter, Heigan will cause certain parts of the room to erupt in violent disease, hitting for a lot of damage. The pattern of which the remainder of the room - the "safe zone" - changes, is predictable, and is the key to winning the fight.
Flash Animatation showing the Eruptions/Safe zones.
As seen on the animation, the first Eruption will leave Zone 1 as safe. The second Eruption - Zone 2, and so on.

During Phase 1 Eruptions will be separated by 8-10 seconds, giving the raid enough time to move. During Phase 2 they will happen a lot more frequently, giving the raid no more than 1 second time to rest between Erruptions, which makes healing through this Phase very hard if many people are taking damage.
Phase 1 will last 90 seconds, and Phase 2 - 45, making a 135-second cycle. After each Phase 2, Heigan will re-enter Phase 1, and the Safe Zone will be 1 again.

In Normal difficulty, Heigan the Unclean has approximately 3,060,000 hit points.

Abilities
Phase 1: The Slow Dance
Spell Disruption - Every few seconds Heigan will debuff everybody in 20 yards range with a debuff that decreases casting time by 300% for 10 seconds.
Decrepit Fever - Throughout the fight Heigan will apply a disease to all players in 20 yards range, which decreases their maximum health by 50% and does 3,000 Nature damage every 3 seconds, for 21 seconds.
Eruption - Every ~8 seconds, Heigan will cause 75% of the room (platform not included) to erupt in poison, inflicting 6,650 to 7,350 Nature damage around the edges of the eruption, and more in the center. The "safe zone" will change in predictable pattern after each Eruption.
Teleport: Platform - After 90 seconds in Phase 1 Heigan will teleport to his platform and enter Phase 2.
Phase 2: The Fast Dance
Plague Cloud - During all of Phase 2, Heigan will channel this spell, dealing 7,500 Nature damage every 1 second to all players on his platform.
Eruption - During this Phase Eruptions will happen a lot faster - approximately every 2-3 seconds. The platform will no longer be safe due to the Plague Cloud.
Teleport: Dance Floor - After 45 seconds in Phase 2, Heigan run back to the floor of the room, and re-enter Phase 1.

 

 

 

 

 

Loatheb!

Click here to see the Tankspot video on this fight.

Loatheb is a DPS race, where the raid takes progressively more damage the longer the fight takes, eventually reaching an unhealable point.
Soon after the beginning of the fight, Loatheb will start using his 2 main abilities - Necrotic Aura and Summon Spore. Necrotic Aura will create a 17/3-second cycles: 17 seconds when all healing is reduced by 100%, and 3 seconds when healing is allowed. It is important for healers to be able to cast as many heals as possible in these 3 seconds. Watching the time left until the Aura fades, and starting a long cast a little before it goes off will usually allows healers to fit an extra heal in.
The other spell, Summon Spore is essential for winning the race. Spores will spawn throughout the room, and attack whoever is highest on threat - usually the healers. Their melee damage is insignificant even for a cloth-user, and they have ~3,000 hit points. Killing a spore will grant the 5 nearest players a +50% critical strike buff, and will reduce their threat output to 0, so establishing a rotation is important. The buff lasts for 90 seconds, so 2 full groups of 5 people can keep their buff up during all of the fight.

In Normal difficulty, Loatheb has approximately 6,690,000 hit points.

Abilities
Necrotic Aura - Soon after the group engages Loatheb, he will enter a 20-second cycle of Necrotic Aura. The aura will block all healing for 17 seconds, and then allow healing for 3 seconds. The cycle repeats until Loatheb is dead. A raid warning-like message "The power of Necrotic Aura begins to wane" appears ~3 seconds before the Aura goes off. Another raid warning will announce its restoring.
Summon Spore - Every ~30 seconds, Loatheb will summon a Spore somewhere in the room. Killing the spore will buff the 5 closest people in ~10 yd range with Fungal Creep, which increases critical strike chance by 50%, and reduces all threat by 100%, for 90 seconds. Fungal Creep doesn't stack.
Deathbloom - Loatheb will cast Deathbloom on random party member every 30 seconds. The debuff will tick for 200 Nature damage every 1 seconds, for 6 seconds. In addition, after 6 seconds it will "bloom", causing additional 1,200 damage.
Inevitable Doom - 2 minutes within the encounter, Loatheb will start casting Inevitable Doom, rarely in the beginning, and more frequently as the fight goes on. 7 minutes within the fight Loatheb will "enrage", casting Doom every 15 seconds. This spell inflicts 4,000 Shadow damage to all players in the room after 10 seconds.